92 research outputs found
Optimization of Band Gap and Thickness for the Development of Efficient n-i-p+ Solar Cell
By using an electrical-optical AMPS-1D program (One Dimensional Analysis of Microelectronic and
Photonic structures), a n-i-p type solar cell, based on hydrogenated amorphous silicon (a-Si : H) and hydrogenated
nanocrystalline silicon oxide (nc-SiOx : H) has been investigated and simulated. The numerical
analysis describes the modeling of the external cell performances, like, the short-circuit current (JSC), the
open circuit voltage (VOC), the fill factor (FF) and efficiency (Eff) with the oxygen content in the p-ncSiOx
: H window layer by varying its mobility band gap (Eg) associated simultaneously to the effect of the
absorber layer (i-a-Si : H) thickness. Also, the i-a-Si : H absorber layer band gap was optimized. The simulation
result shows that the VOC depend strongly on the band offset (ΔEV) in valence band of p-side. But,
VOC does not depend on the thickness of the intrinsic layer. However, VOC increases when the energy band
gap of the intrinsic layer is higher. It is demonstrated that the highest efficiency of 10.44 %
(JSC = 11.67 mA/cm2; FF = 0.829; VOC = 1070 mV) has been obtained when values of p-nc-SiOx : H window
layer band gap, i-a-Si : H absorber layer band gap and i-a-Si : H absorber layer thickness are 2.10 eV,
1.86 eV, and 550 nm, respectively
Optimization of Band Gap and Thickness for the Development of Efficient n-i-p+ Solar Cell
By using an electrical-optical AMPS-1D program (One Dimensional Analysis of Microelectronic and
Photonic structures), a n-i-p type solar cell, based on hydrogenated amorphous silicon (a-Si : H) and hydrogenated
nanocrystalline silicon oxide (nc-SiOx : H) has been investigated and simulated. The numerical
analysis describes the modeling of the external cell performances, like, the short-circuit current (JSC), the
open circuit voltage (VOC), the fill factor (FF) and efficiency (Eff) with the oxygen content in the p-ncSiOx
: H window layer by varying its mobility band gap (Eg) associated simultaneously to the effect of the
absorber layer (i-a-Si : H) thickness. Also, the i-a-Si : H absorber layer band gap was optimized. The simulation
result shows that the VOC depend strongly on the band offset (ΔEV) in valence band of p-side. But,
VOC does not depend on the thickness of the intrinsic layer. However, VOC increases when the energy band
gap of the intrinsic layer is higher. It is demonstrated that the highest efficiency of 10.44 %
(JSC = 11.67 mA/cm2; FF = 0.829; VOC = 1070 mV) has been obtained when values of p-nc-SiOx : H window
layer band gap, i-a-Si : H absorber layer band gap and i-a-Si : H absorber layer thickness are 2.10 eV,
1.86 eV, and 550 nm, respectively
Electrical properties of short period InAs/GaSb superlattice
International audienc
An ACG View on G-TAG and Its g-Derivation
International audienceG-TAG is a Tree Adjoining Grammar (TAG) based formalism which was specifically designed for the task of text generation. Contrary to TAG, the derivation structure becomes primary, as pivot between the conceptual representation and the surface form. This is a shared feature with the encoding of TAG into Abstract Categorial Grammars. This paper propose to study G-TAG from an ACG perspective. We rely on the reversibility property of ACG that makes both parsing and generation fall within a common morphism inversion process. Doing so, we show how to overcome some limitations of G-TAG regarding predicative adjunction and how to propose alternative approaches to some phenomena
TWAM: A Certifying Abstract Machine for Logic Programs
Type-preserving (or typed) compilation uses typing derivations to certify
correctness properties of compilation. We have designed and implemented a
type-preserving compiler for a simply-typed dialect of Prolog we call T-Prolog.
The crux of our approach is a new certifying abstract machine which we call the
Typed Warren Abstract Machine (TWAM). The TWAM has a dependent type system
strong enough to specify the semantics of a logic program in the logical
framework LF. We present a soundness metatheorem which constitutes a partial
correctness guarantee: well-typed programs implement the logic program
specified by their type. This metatheorem justifies our design and
implementation of a certifying compiler from T-Prolog to TWAM.Comment: 41 pages, under submission to ACM Transactions on Computational Logi
Theories with the independence property
A first-order theory T has the Independence Property provided T ⊢ (Q)(Φ⇒
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